Rotary pump.



No. 730,052. PATENTEDJUNE 2,- 1903..

- ,;W. s. SHARPNEGK. ROTARY PUMP.

APPLIOATION FILED SEPT. 25. 1901.

1 10 MODEL.

' UNITED STATES.

Patented June 2, 1903.

PATENT OFFICE."

WILLIAM S. SHARPNECK, OF CHICAGO, ILLINOIS, ASSIGNOR TO EVERETT W. BROOKS, OF CHICAGO, ILLINOIS.

ROTARY PU M P.

SPECIFICATION" forming part of Letters Patent No. 730,052, dated June 2, 1903. Application filed September 25. 1901. Serial Nio. 761524. Q model.)

To all whom it may concern: I I

Be it known that LWILLIAM S. SHARPNEOK,

a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Rotarytion.

This invention relates to improvements in rotary pumps, and refers more specifically.

to improvements in pumps of that type described in reissued Letters Patent No.12, 001,

7 granted to me June 17, 1902, and in which a of the blades or vanes of the piston upon the hollow shell-like piston, provided internally with pallets or vanes, is rotated and operates to pump the liquid by the centrifugal action imparted thereto.

The present invention is in the nature of an improved and further development of an invention describedand patented to me in Letters Patent No. 644,475, dated February 27, 1900; and the object of the present invention is to provide an improved construction in which the piston operates-more effectively in producing an exhausting. or sucking action and in which also the expelling action upon the liquiddue to centrifugal forceis added to by the expelling action due to direct impact liquid. V

The inventionhas also in view theproduction of an extremely'simple, cheap, and durable construction. 1

To these ends the invention consists in the matters hereinafter described, and more particularly pointed out in the appended claims, and the same will be readily understood from the following description, reference beinghad to the accompanying drawings, in which 7 Figure 1 is an axial and sectional view of a pump-head and connecting parts einbodying a preferred form of my invention. Fig.

2 is atransverse sectional view taken on line 2 2 of Fig. 1 and, looking in the direction of the arrows. Fig. 3 is an endview of'the inlet end of the piston removed from its casing, the direction of rotation-in operation being indicated by the arrow. Fig. 4 is a central transverse sectional view of the piston viewed in the same direction as in Fig. 3.

Referring to said drawings, 1 designates as awhole the pumpcasing, which is shown in the present instance as internally cylindric posed a cylindric shell or casting 4, the peripheries of the end castings 2 and 3 and the end margins of the cylindric shell being united by means of bolts 5, extended through outturned flange portions 6 upon the shell memloc -4 andv through corresponding parts of the .peripheriespf the end castings, as indicated clearly in the drawings. The endcasting 2 is provided with an integral axially-disposed tubular extension 7, which forms the inletaperture 8 of the pump, the outer end of this extension being desirably internally threaded, as indicated-at 9,'to receive the end of the suction-pipe 10, which communicates with the source of its supply. The end member or casting 3 is also provided with an axially-disposed extension 11, which is axially bored, as indicated at 12, and forms a journal-bearing whetherupwardly, downwardly, or to either side, is immaterial, and for that matter the pumpneed not be arranged horizontally as shown, but may be arranged in any other position as found convenient or desirable.

Describing now more sp'eciflcallythe construction" of the piston, this member aspreferabl'y constructed comprises two disk-like end-members 19 and 20, respectively, and an in substance a pair of pallets or vane-like blades arranged in diametrically opposite relation. The end member 19 is provided with and constructed of two disk-like end castings '2 and 3, respectively, between which is interand support for the actuating-shaft 13, upon interposed diaphragm 21, which constitutes.

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an axially-disposed inlet-aperture, which is desirably somewhat larger than the inletaperture 8 of the pump-casing, so as to afford free entrance to the interior of the pistonshell. The opposite end member 20 preferably completely closes that end of the piston and is provided at its center with an inwardlyextendinghollow boss or socket 22,with which is rigidly engaged the end of the actuatingshaft 13, thereby supporting the piston accurately within the casing and preferably entirely free from contact with the inner walls of the latter. The internal diameter of the casing is somewhat greater than the external diameter of the piston, so as to afford an annular space 23 between said members, but the end walls of the casin g are desirablyconstructed to fit as closely to the ends of the piston as is consistent with freedom of movement.

The diaphragm 21 is of peculiar and novel form, its construction being such in cross-section as to provide two spirally-disposed vanes or blades 24 and 25, united with each other by means of a reverse-eurved portion 26, the spirals merging into the reversed-curved portion smoothly, so that there are thereby formed two spiral liquid passages 27 and 28, extending from the axial portion of the piston outwardly to the peripheries thereof, as shown clearly in. Figs. 2, 3, and 4. The two vanes 24 and 25 desirably extend at their outer ends flush with the outer periphery of the piston, and a free discharge-passage 29 for the liquid is formed between the rear end of each vane and the rear side of the preceding vane, as best indicated in Fig. 2. In other words, the body of the piston is open at its sides, except to the extent it is closed bythe spiral vanes or blades themselves.

In operation the pump-piston is rotated in the direction indicated by the arrow in Figs. 2, 3, and or, in other words, in such a direction as to constantly present the convexlycurved portions 30, formed at the juncture of the spiral portions with the reversely-curved portions and the convex surface of the spiral portions 2a and 25 to the body of water within the pump. The rapid rotation of the piston therefore not only serves to impart a rotary movement to the liquid body, which creates a strong centrifugal force, but also serves to force the water outwardly positively after the manner of a propeller blade. These two forces therefore act together to expel the liquid from the pump-casing and obviously to create a suction which correspondingly draws in the liquid from the sources of supply.

It is found in practice that a pump con structed in accordance with the present invention is extremely effective as aforce-pump, enabling the water to be sent to great heights or against high pressures very efiectively, while at the same time it is correspondingly eifective in drawing or sucking in the liquid from a suitable source of supply.

It will be noted that the passages 27 and 28 are somewhat larger at the axial portion of the piston than elsewhere, or, in other words, contract outwardly, and this, coupled with the fact that the vanes are imperforate, doubtless contributes in producing an effective exhausting action, since such a construction prevents the backi'low or venting of air through the discharge-ports of the piston. It is further to be noted that the shape of the diaphragm which forms the vanes is such that a minimum resistance to the passage of the diaphragm through the liquid is afforded consistent with imparting to the liquid the desired movement. I11 other words, asmoothlyrounded and obliquely-disposed surface is constantly presented to the body of water, and that portion of the opposing surface of the vane or blade which is most nearly radial is also nearest the axis of the piston, where the movement of rotation is least. It results, therefore, that the pump may be driven with a minimum expenditure of power relatively to its pumping capacity.

It will be understood that the details of construction may be considerably varied without departing from the invention, and I do not, therefore, limit myself to the details shown herein, except to the extent that they are made the subject of specific claim.

I claim as my invention- 1. In a centrifugal pump, the combination of a piston comprising a pair of disk-like end members, one of which is imperforate and the other provided With an axially-disposed inletport, a sheet-like diaphragm extending between said end members and folded or recurved upon itself to form in cross-section two diametrically opposite spirallycurved pallet-blades each extending from the periphcry of the piston inwardly toward the axis thereof, and an intervening portion uniting said spirally-disposed blades reversely curved in cross-section and the curves whereof merge smoothly into the curves of the blades, the passage-forming sides of said blades being outwardly convergent, a casing inclosin g said piston, the internal diameter of which is greater than the exterior diameter of the piston whereby an intervening annular piston is formed, an inlet through said casing in register with the end port of the piston, and an outlet in said casing communicating with the said annular space thereof.

2. In a centrifugal pump, the combination of a piston comprising a pair of disk-like end members, one of which is imperforate and the otherprovided with an axially-disposed inletport, a sheet'like diaphragm extending between said end members and folded or recurved upon itself to form in cross-section two diametrically opposite spirallycurved pallet blades each extending from the periphery of the piston inwardly toward the axis thereof, and an intervening portion uniting said spirally-disposed blades reversely curved in cross-section and the curves whereof merge ICO ICS

smoothly into the curves of the blades, the outlet in said casing radially opposite the pepassage-forming sides of said blades being riphery of the piston, substantially as de- IO outwardly convergent, a casinginclosing' said scribed. l

piston, the internal diameter of which is 5 greater than-the exterior diameter of the pis- VILLIAM SHARPNEOK' formed, an inlet through said casing in register with the end port of the piston, and an FREDERICK C. GOODWIN, ALBERT H. GRAVES I ton whereby an lntervenlng annular space 1s W1tnesses: 

